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CVE-2026-39911— Hashgraph Guardian 3.5.1 Unsandboxed JavaScript Execution RCE

Quick assessment

Affected
hashgraph guardian
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Guardian是Hedera开源的一个基于策略的数字资产管理与验证平台。 Guardian 3.5.0及之前版本存在安全漏洞，该漏洞源于自定义逻辑策略块工作线程中未沙箱化的JavaScript执行，可能导致认证的标准注册表用户通过用户提供的JavaScript表达式执行任意代码。

CVSS 8.8 · High EPSS 0.79% · P55

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
hashgraph guardian ≤ 3.5.1 affected
45fbe2f7e0e8feee30105d42d66ed63fb6177ebe unaffected
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I. Basic Information for CVE-2026-39911

Vulnerability Information
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Vulnerability Title
Hashgraph Guardian 3.5.1 Unsandboxed JavaScript Execution RCE
Source: CVE Program / CVE List V5
Vulnerability Description
Hashgraph Guardian through version 3.5.1, fixed in commit 45fbe2f, contains an unsandboxed JavaScript execution vulnerability in the Custom Logic policy block worker that allows authenticated Standard Registry users to execute arbitrary code by passing user-supplied JavaScript expressions directly to the Node.js Function() constructor without isolation. Attackers can import native Node.js modules to read arbitrary files from the container filesystem, access process environment variables containing sensitive credentials such as RSA private keys, JWT signing keys, and API tokens, and forge valid authentication tokens for any user including administrators.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
将资源暴露给错误范围
Source: CVE Program / CVE List V5
Vulnerability Title
Guardian 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Guardian是Hedera开源的一个基于策略的数字资产管理与验证平台。 Guardian 3.5.0及之前版本存在安全漏洞，该漏洞源于自定义逻辑策略块工作线程中未沙箱化的JavaScript执行，可能导致认证的标准注册表用户通过用户提供的JavaScript表达式执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
hashgraph guardian 0 ~ 3.5.1 -

II. Public POCs for CVE-2026-39911

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III. Intelligence Information for CVE-2026-39911

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Patches & Fixes for CVE-2026-39911 (2)

IV. Related Vulnerabilities

Same product: guardian
Same vendor: hashgraph
Same weakness: CWE-668

V. Comments for CVE-2026-39911

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